Integrated: 8297733: Refactor Cast binding to enum

[Jorn Vernee]

On Mon, 28 Nov 2022 20:13:35 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> Refactor the cast binding to an enum, which clearly enumerates all supported conversions.
> 
> This also fixes a bug where `java/foreign/normalize/TestNormalize` was failing when running in interpreted mode (`-Djdk.internal.foreign.DowncallLinker.USE_SPEC=false`), for conversions from `int` to `byte` because the `explicitCast` method handle that was used only considers the least significant bit, while we want to look at all of the least significant byte.
> 
> As mentioned in the JBS issue, doing this will also make it easier going forward to support multiple conversions with the same from and to types, but requiring different semantics.
> 
> Testing: jdk_foreign test suite.

This pull request has now been integrated.

Changeset: a38c63da
Author:    Jorn Vernee <jvernee at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/a38c63da5632fe727838ff1ed88d9601bf954801
Stats:     82 lines in 2 files changed: 56 ins; 14 del; 12 mod

8297733: Refactor Cast binding to enum

Reviewed-by: mcimadamore

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PR: https://git.openjdk.org/jdk/pull/11397